int srslte_ue_dl_decode_rnti_rv(srslte_ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint16_t rnti, uint32_t rvidx)
{
srslte_dci_msg_t dci_msg;
srslte_ra_dl_dci_t dci_unpacked;
srslte_ra_dl_grant_t grant;
int ret = SRSLTE_ERROR;
if ((ret = srslte_ue_dl_decode_fft_estimate(q, input, sf_idx, &q->cfi)) < 0) {
return ret;
}
if (srslte_pdcch_extract_llr(&q->pdcch, q->sf_symbols, q->ce, 0, sf_idx, q->cfi)) {
fprintf(stderr, "Error extracting LLRs\n");
return SRSLTE_ERROR;
}
int found_dci = srslte_ue_dl_find_dl_dci(q, &dci_msg, q->cfi, sf_idx, rnti);
if (found_dci == 1) {
if (srslte_dci_msg_to_dl_grant(&dci_msg, rnti, q->cell.nof_prb, &dci_unpacked, &grant)) {
fprintf(stderr, "Error unpacking DCI\n");
return SRSLTE_ERROR;
}
ret = srslte_ue_dl_decode_rnti_rv_packet(q, &grant, data, q->cfi, sf_idx, rnti, rvidx);
}
if (found_dci == 1 && ret == SRSLTE_SUCCESS) {
return q->pdsch_cfg.grant.mcs.tbs;
} else {
return 0;
}
}
int srslte_ue_dl_find_and_decode(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
srslte_pdsch_cfg_t* pdsch_cfg,
uint8_t* data[SRSLTE_MAX_CODEWORDS],
bool acks[SRSLTE_MAX_CODEWORDS])
{
int ret = SRSLTE_ERROR;
srslte_dci_dl_t dci_dl;
srslte_pmch_cfg_t pmch_cfg;
srslte_pdsch_res_t pdsch_res[SRSLTE_MAX_CODEWORDS];
// Use default values for PDSCH decoder
ZERO_OBJECT(pmch_cfg);
uint32_t mi_set_len;
if (q->cell.frame_type == SRSLTE_TDD && !sf->tdd_config.configured) {
mi_set_len = 3;
} else {
mi_set_len = 1;
}
// Blind search PHICH mi value
ZERO_OBJECT(dci_dl);
ret = 0;
for (uint32_t i = 0; i < mi_set_len && !ret; i++) {
if (mi_set_len == 1) {
srslte_ue_dl_set_mi_auto(q);
} else {
srslte_ue_dl_set_mi_manual(q, i);
}
if ((ret = srslte_ue_dl_decode_fft_estimate(q, sf, cfg)) < 0) {
return ret;
}
ret = srslte_ue_dl_find_dl_dci(q, sf, cfg, pdsch_cfg->rnti, &dci_dl);
}
if (ret == 1) {
// Logging
char str[512];
srslte_dci_dl_info(&dci_dl, str, 512);
INFO("PDCCH: %s, snr=%.1f dB\n", str, q->chest_res.snr_db);
// Force known MBSFN grant
if (sf->sf_type == SRSLTE_SF_MBSFN) {
dci_dl.rnti = SRSLTE_MRNTI;
dci_dl.alloc_type = SRSLTE_RA_ALLOC_TYPE0;
dci_dl.type0_alloc.rbg_bitmask = 0xffffffff;
dci_dl.tb[0].rv = 0;
dci_dl.tb[0].mcs_idx = 2;
dci_dl.format = SRSLTE_DCI_FORMAT1;
}
// Convert DCI message to DL grant
if (srslte_ue_dl_dci_to_pdsch_grant(q, sf, cfg, &dci_dl, &pdsch_cfg->grant)) {
ERROR("Error unpacking DCI\n");
return SRSLTE_ERROR;
}
// Calculate RV if not provided in the grant and reset softbuffer
for (int i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
if (pdsch_cfg->grant.tb[i].enabled) {
if (pdsch_cfg->grant.tb[i].rv < 0) {
uint32_t sfn = sf->tti / 10;
uint32_t k = (sfn / 2) % 4;
pdsch_cfg->grant.tb[i].rv = ((uint32_t)ceilf((float)1.5 * k)) % 4;
}
srslte_softbuffer_rx_reset_tbs(pdsch_cfg->softbuffers.rx[i], (uint32_t)pdsch_cfg->grant.tb[i].tbs);
}
}
bool decode_enable = false;
for (uint32_t tb = 0; tb < SRSLTE_MAX_CODEWORDS; tb++) {
if (pdsch_cfg->grant.tb[tb].enabled) {
decode_enable = true;
pdsch_res[tb].payload = data[tb];
pdsch_res[tb].crc = false;
}
}
if (decode_enable) {
if (sf->sf_type == SRSLTE_SF_NORM) {
if (srslte_ue_dl_decode_pdsch(q, sf, pdsch_cfg, pdsch_res)) {
ERROR("ERROR: Decoding PDSCH\n");
ret = -1;
}
} else {
pmch_cfg.pdsch_cfg = *pdsch_cfg;
if (srslte_ue_dl_decode_pmch(q, sf, &pmch_cfg, pdsch_res)) {
ERROR("Decoding PMCH\n");
ret = -1;
}
}
}
for (uint32_t tb = 0; tb < SRSLTE_MAX_CODEWORDS; tb++) {
if (pdsch_cfg->grant.tb[tb].enabled) {
acks[tb] = pdsch_res[tb].crc;
}
}
}
return ret;
}
